Blow-off cock.



L. L. DAWSON & J. L. ROACH.

BLOW-OFF COCK.

APPLICATION FILED'JUNE 3. 1914.

1,161,763. Patented Nov. 23, 1915.

i To all whom it may concern:

UiviTin) STATES PATENT OFFICE.

JOHN L. ROA'CI-I AND LANCE L. DAVSON, OF CHILDRESS, TEXASV BLOW-OFFc'ooK.

Specification of Letters Patent.

Patented Nev. 23,1915.

Application filed. June 3, 1914. Serial Noi8'512,799.

Be it known that we, JOHN L. ROAQI-I and LANCE L. DAWSON, citizens ofthe United States, residing at Cliildress, in the county of Childressand State of" Texas, have invented new and useful Improvements inBlow-Off Cocks, of which the following is aspecification. B

Our present invention pertains to blowoif cooks for use on locomotiveand other boilers; and it contemplates the provision of a blow-off cock.of such construction that access can be readily had to the'main controlling valve for cleaning or grinding thereof, without the liabilityof hot water or steam escaping from'the boiler, and without thenecessity of killing the fire and emptying the boiler of water as acondition precedent to removing the main valve'for the-purposes stated,'or for any other purpose.

The invention in all of its details will be fully understood from thefollowingdescription and claim when the same are read inconnection withthe drawings, accompanying and forming partof this specification, inwhich:

Figure 1 is a longitudinal section of the blow-off cock constituting thebest practical embodiment of our invention that we have as yet devised,and showing the main valve of the cock in partly closed position, and

the auxiliary valve thereof inv open position. Fig. 2 is a transversesection taken in the plane indicated by the line 22 of Fig. 1, lookingtowardt-he left. Fig. 3 is a transverse section taken in the planeindicated by the line 33 of Fig. 1, looking toward the left, and showingone of the openings in the valve seat. Fig. 4 is a detail view showingthe angular formation of the outer portion of the main-valve stem, andalso showing the two stops and the lug between the same.

Similar numerals of reference designate corresponding parts in all ofthe views of the drawings.

The body casing of our novel cock'comprises an inner member 1, and anouter member 2, the outer member being detachably connected with theinner member, preferably by a thread 3, as shown in Fig. 1'. The innermember 1 is provided with a reduced and threaded portion 4 that isthreaded into the wall 5 of the water leg or other suitable part of theboiler. In the said portion a is a valve seat 6, that is preferablybeveled, as shown, and on said portion l and designed to rest within theboiler is a cage 5 having openings 7, and

also having @a diamet ically disposed stop 8, the inner end of thesaidcage beingopen,

as illustrated.

Movable in the cage 5 and-between the valve seat 6 and the stop 8 is theauxil ary valve 9 of our cock ,'which auxiliary valve 9 is equipped witha'stein 10. V

The outer member 2 of the body casingfis provided withan outlet 11, andis also provided with an inner end portion 12 in which are twodiametrically opposite openings 13.;

The inner end of the portion 12 forms a seat 1% for the main valve 15 ofthe cock, the said valve 15 comprising two wings arrangeddiametricallyopposite each other so that on rotary movement of the main valve 15 inone direction through about a quarter of a revolution, the wings willleave the openings 13 in communication with the interior of the member1, while on a corresponding movement'of the valve in the other directionopenings 13 to the interior of the member 1 and the boiler, and in thatway prevent the escape of steam and water through the outlet 11.

outer portion of the valve stem 10, and fixed with, respect to andextending outwardly from the valve 15 is a stem 16. This stein lti 'isarranged snugly in a sleeve 17 of the ineinber2, and consequently itwill be manifeet that while the said stem 16 can be readily turned aboutits axis in thesleeve 17, there is no liabilityof steam or hot waterescaping between the stem and the sleeve and hence no necessity ofemploying packing. In the stem 16 is a threaded bore and a plain; orsmooth bore to receive the threaded portion 18 and the smooth portion'19, respectively, of a stemtha-t under normal conditions rests in therelative position shown,

' and serves by engaging the stem 10 to hold the auxiliary valve 9 awayfI'Olil'lllS seat 6.

At its outer end the stem that has the thread ed portion 18 and theplain portion 19, is

provided with a head 20, and atits inner side the said head bearsagainst a washer The valve 15 is provided with a central aperture 16that loosely receives the the wings will eii'ectually close the i incross-section, so as to hold the handle against turning thereon.

At'ltS inner side, the handle 1s provided with a lug 24, and this lug 2ais movable be-v the member 1, while when the lug 24L is against theother stop 25 the openings 13 are effectually closed to the interior ofthe mem- 1 ber l and the interiorof the boiler.

In the practical use of our novel blow-off cock, when it is desired toremove the main valve 'for'cleaning or grinding, or for any otherpurpose and this without killing the fire and discharging the boiler ofwater. the stem having the plain and threaded portions is removed. Whenthis is done, the pressure in the boiler'is enabled to close the valve 9against its seat 6, the pressure on the back of the valve being greaterthan on the front thereof, due to. the spacetaken up by the any reasonthe auxiliary valve 9 should fail to close, the main valve 15 can beopened afterthe removal of the stem therefrom.

whereupon the momentum of the water in escaping through the blow-offcock Wlll close the auxiliary valve 9.

The main valve 15 is removed with the member 2- of the casing body, whensaid member 2 is disconnected from the member 1. It will also beobserved that after the member 2 is connected to the member 1 and thestem is replaced in the stem of the main valve and adjusted to theposition shown in Fig. 1, it will operate to move the auxiliary valve 9to and hold said valve 9 in the open position illustrated.

It will be gathered from the foregoing that our novel blow-off cock issimple, inexpensive and durable in construction, and that because of thefact that it is unnecessary to employ packing inthe cook, the up keep ofthe cock is practically nothing and engine failures, due to packingblowing out,

are entirely eliminated.

The handle in closed position stands at forty five degrees to the right;the stop 25 in Fig.1 being shown by dotted lines beyond theprojection-24 on the handle.

WVe prefer to provide the stem 10 with a collar 9 to enable the momentumof water to better close the auxiliary valve when the main valve isopened after the removal of stem 19.

, Having described our invention, what we claim and desire tosecure byLetters Patent, is: 1

The herein described blow-ofi cock, comprising an inner casing sectionhaving a cage, a valve seat at the outer end of the cage and a stop inthe inner portion of said cage, said section being constructed andarranged to be connected to a boiler wall and to projectoutwardlytherefrom; an outer casing section detachably connected to theinner section and having a valve seat at its inner end and an opening insaid end and also having an outlet and a longitudinal sleeve; anauxiliary valve movable in the cage of the inner sectionbetween the stopat the inner'end of the cage and the seat at the outer end of the cageand having an outwardly extending stem; a revoluble main valve having aportion constructed and arranged in one position to close the opening inthe outer casing section and also having a stem removably-mounted in thesleeve of the outer casing section, said stem being pro vided with anouter portion of angular form in cross-section and being also providedwith a bore the outer portion of which is threaded and the inner portionof which is plain and receives the stem of the auxiliary valve; stops onthe outer section of the casing; a handle mounted on the outer angularportion of the main valve stem and having a lug movable between saidstops; and a stem removably arranged in the bore of the main valve stemand having a threaded portion and a plain portion, said stem operatingagainst the stem of the auxiliary valve to witnesses. I

' JOHN L. ROACH.

LANCE L. DAWSON.

vVitnesses I W. G. MURPHY, J. H. Hannison.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Batents,

Washington, D. G.

